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## Heart of algebra

Current time:0:00Total duration:1:20

# Solving linear equations and linear inequalities — Basic example

## Video transcript

- [Instructor] Three l
minus six is greater than or equal to eight. Which of the following best
describes the solutions to the inequality shown above? So it's three times l minus six is greater than or equal to eight. Well, all of these choices,
these are in terms of l. They said l on one side,
and is greater than or equal to, actually all of these choices are greater than or
equal to something else. So let's see what we can do to get just an l on the left-hand side. So the first thing we might wanna do, is let's get rid of
this subtracting of six. And the best way we can
do that is we can add six. Let's add six to both sides. This six and this six
are going to add to zero. And then we are going to be left with, we're going to be left with three l on the left-hand side is greater than or equal
to eight plus six is 14. Now just got an l on the left-hand side. We can divide both sides by three. And if you divide both sides by three, you're not going to change the sign. You're not gonna change the inequality. If you're dividing by a negative number you would swap the inequality. Greater than or equal to would turn to less than or equal to. But we're dividing by a positive number, so this is going to be l is greater than or
equal to 14 over three. Which is that choice right there.